String tuning mechanism



FIG. 1 is a front and side perspective view of a string tuning mechanism showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a back side view thereof;

FIG. 5 is a front side view thereof;

FIG. 6 is a top side view thereof;

FIG. 7 is a bottom side view thereof;

FIG. 8 is a back view of the string tuning mechanism installed into a guitar headstock;

FIG. 9 is a front view of the string tuning mechanism installed into a guitar headstock; and,

FIG. 10 is a front view of the string mechanism installed in to an alternative guitar headstock.

The broken line showing in FIGS. 8-10 is for environmental purposes only and forms no part of the claimed design. 

The ornamental design for a string tuning mechanism, as shown and described. 